Ch00-intro variables

Ch00-intro variables - CHM 341 Elementary Physical...

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Chapter 0: Intro: Variables CHM 341 Elementary Physical Chemistry Fall 2009 Ranko Richert
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physical state : solid - liquid - gas mass m : amount of material [kg = 10 3 g] volume V : occupied space [cm 3 , m 3 , L, mL] force F : F = ma (mass x acceleration) [N = kg m s -2 ] work w :w = Fd (force x distance) [N m = kg m 2 s -2 ] energy E kin = ½ mv 2 [J = kg m 2 s -2 ] E pot = m g h E coul = Q 1 Q 2 / 4 πε 0 r [J = kg m 2 s -2 ] pressure p = F / A (force per area) [Pa = N m -2 = kg m -1 s -2 ] basic variables, definitions, units
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Equation of state: n T p V n V T p , , of function , , of function = = area force pressure = on accelerati mass force × = A ma A F p = = 2 s m 81 . 9 gravity subject to mass × = = m mg F m g mv x -mv x Origin of pressure a gas exerts on a wall
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2 0 2 2 4 2 1 5 0 2 0 0 0 cm 1 kg 1 or kg 1 s m 9.81 m 10 s m kg 10 1.019 : cm 1 with g p g A p m A g A p m mg A p A p F mg F up down × = = × = = = = = = = 1 cm 1 cm mass equivalent to atmospheric pressure (for an area of A = 1 cm 2 )
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gh A hAg A Vg A mg A F p ρ = = = = =
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g p p h A p F hg A pA F g p h hg p hg A pA hg A Vg mg F pA F F F Hg ex ex right Hg left Hg Hg Hg
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Ch00-intro variables - CHM 341 Elementary Physical...

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